Plastic drawing response in the biaxially oriented polypropylene (BOPP) process: polymer structure and film casting effects
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Dietrich Gloger
und
Christina Wagner
Abstract
Processing isotactic polypropylene (iPP) from cast film into biaxially oriented polypropylene (BOPP) involves plastic drawing of a semi-crystalline morphology in the melting range of iPP, where the crystal phase is reduced and the polymer has high mobility. The literature claims that plastic drawing in general and at elevated temperatures in particular depends predominantly on the structure of the amorphous entanglement network. We investigated this aspect using laboratory-scale biaxial drawing experiments. Three iPP homopolymer types differing in chain isotacticity and molecular weight distribution were extruded into 200-μm-thick primary sheets using 10 different extrusion settings. The sheets were biaxially drawn on a laboratory stretcher at 157°C and 160°C, recording the respective stress-strain curves. These curves were evaluated according to a rubber elasticity model to obtain the network modulus, GN, of the entanglement network. The effects of iPP type, the extrusion parameters, the resulting cast film properties, and the draw temperature on GN are discussed.
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Supplementary Material
The online version of this article offers supplementary material (https://doi.org/10.1515/polyeng-2019-0220).
©2019 Walter de Gruyter GmbH, Berlin/Boston
Artikel in diesem Heft
- Frontmatter
- Editorial
- Special issue: Polymer engineering rheology
- Material properties
- Volume fraction and width of ribbon-like crystallites control the rubbery modulus of segmented block copolymers
- Influence of trisilanol isooctyl POSS content on the structure, morphology and rheological properties of thermoplastic polyurethane (TPU)
- Engineering and processing
- Oscillating shear capillary rheometry (OSCAR) for polymer melts
- Plastic drawing response in the biaxially oriented polypropylene (BOPP) process: polymer structure and film casting effects
- A quantitative study on using digital photoelasticity for characterising the effect of the stretching speed on the necking phenomenon
- Effects of structure and processing on the surface roughness of extruded co-continuous poly(ethylene) oxide/ethylene-vinyl acetate blends
- Processability predictions for mechanically recycled blends of linear polymers
- Prediction of the maximum flow length of a thin injection molded part
Artikel in diesem Heft
- Frontmatter
- Editorial
- Special issue: Polymer engineering rheology
- Material properties
- Volume fraction and width of ribbon-like crystallites control the rubbery modulus of segmented block copolymers
- Influence of trisilanol isooctyl POSS content on the structure, morphology and rheological properties of thermoplastic polyurethane (TPU)
- Engineering and processing
- Oscillating shear capillary rheometry (OSCAR) for polymer melts
- Plastic drawing response in the biaxially oriented polypropylene (BOPP) process: polymer structure and film casting effects
- A quantitative study on using digital photoelasticity for characterising the effect of the stretching speed on the necking phenomenon
- Effects of structure and processing on the surface roughness of extruded co-continuous poly(ethylene) oxide/ethylene-vinyl acetate blends
- Processability predictions for mechanically recycled blends of linear polymers
- Prediction of the maximum flow length of a thin injection molded part
